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Biogeographic variability in the physiological response of the cold-water coral Lophelia pertusa to ocean acidification

Journal article
Authors Samuel E. Georgian
Samuel Dupont
Melissa Kurman
Adam Butler
Susanna Strömberg
Ann I. Larsson
Erik E. Cordes
Published in Marine Ecology
Volume 37
Issue 6
Pages 1345–1359
ISSN 0173-9565
Publication year 2016
Published at Department of marine sciences
Department of Biological and Environmental Sciences, Kristineberg
Pages 1345–1359
Language en
Links doi.org/10.1111/maec.12373
onlinelibrary.wiley.com/doi/10.1111...
Keywords Calcification, Cold-water coral, Deep sea, Energetics, Ocean acidification, Physiology
Subject categories Marine ecology

Abstract

While ocean acidification is a global issue, the severity of ecosystem effects is likely to vary considerably at regional scales. The lack of understanding of how biogeographically separated populations will respond to acidification hampers our ability to predict the future of vital ecosystems. Cold-water corals are important drivers of biodiversity in ocean basins across the world and are considered one of the most vulnerable ecosystems to ocean acidification. We tested the short-term physiological response of the cold-water coral Lophelia pertusa to three pH treatments (pH = 7.9, 7.75 and 7.6) for Gulf of Mexico (USA) and Tisler Reef (Norway) populations, and found that reductions in seawater pH elicited contrasting responses. Gulf of Mexico corals exhibited reductions in net calcification, respiration and prey capture rates with decreasing pH. In contrast, Tisler Reef corals showed only slight reductions in net calcification rates under decreased pH conditions while significantly elevating respiration and capture rates. These differences are likely the result of environmental differences (depth, pH, food supply) between the two regions, invoking the potential for local adaptation or acclimatization to alter their response to global change. However, it is also possible that variations in the methodology used in the experiments contributed to the observed differences. Regardless, these results provide insights into the resilience of L. pertusa to ocean acidification as well as the potential influence of regional differences on the viability of species in future oceans.

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